I don't want to explain the technique of breaking and entering through the use of a bump key. As a lifetime carpenter, I've known of them for many years. The standard joke in my trade is; YOU CAN NEVER KEEP A KARPENTER OUT OF HOUSE!

Suffice it to say that a "bump key" is just a lockset blank that will fit into most any key way of a lock of that brand. There are some technical challenges, which is why they are sold in sets.

My own personel set of bump keys numbers over 100. I still use them occasionally when desparate customers call me because they locked themselves out of their house ... again!

I NEVER carry them in my truck unless I have the address and phone number of the customer I'm heading for. Having a set of these is a VERY quick trip to jail, if a cop sees them. CHEERS, Bob(deckman)Nelson